RFC 1479 (rfc1479) - Page 3 of 108
Inter-Domain Policy Routing Protocol Specification: Version 1
Alternative Format: Original Text Document
RFC 1479 IDPR Protocol July 1993
6.1.1. Implementation. . . . . . . . . . . . . . . . . . . . . . .75
6.2. Route Directionality. . . . . . . . . . . . . . . . . . . . .78
6.3. Route Database. . . . . . . . . . . . . . . . . . . . . . . .79
6.3.1. Cache Maintenance . . . . . . . . . . . . . . . . . . . . .80
7. Path Control Protocol and Data Message Forwarding Procedure . .80
7.1. An Example of Path Setup. . . . . . . . . . . . . . . . . . .81
7.2. Path Identifiers. . . . . . . . . . . . . . . . . . . . . . .84
7.3. Path Control Messages . . . . . . . . . . . . . . . . . . . .85
7.4. Setting Up and Tearing Down a Path. . . . . . . . . . . . . .87
7.4.1. Validating Path Identifiers . . . . . . . . . . . . . . . .89
7.4.2. Path Consistency with Configured Transit Policies . . . . .89
7.4.3. Path Consistency with Virtual Gateway Reachability. . . . .91
7.4.4. Obtaining Resources . . . . . . . . . . . . . . . . . . . .92
7.4.5. Target Response . . . . . . . . . . . . . . . . . . . . . .93
7.4.6. Originator Response . . . . . . . . . . . . . . . . . . . .93
7.4.7. Path Life . . . . . . . . . . . . . . . . . . . . . . . . 94
7.5. Path Failure and Recovery . . . . . . . . . . . . . . . . . 95
7.5.1. Handling Implicit Path Failures . . . . . . . . . . . . . 96
7.5.2. Local Path Repair . . . . . . . . . . . . . . . . . . . . 97
7.5.3. Repairing a Path. . . . . . . . . . . . . . . . . . . . . 98
7.6. Path Control Message Formats. . . . . . . . . . . . . . . . 100
7.6.1. SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . 101
7.6.2. ACCEPT. . . . . . . . . . . . . . . . . . . . . . . . . . 103
7.6.3. REFUSE. . . . . . . . . . . . . . . . . . . . . . . . . . 103
7.6.4. TEARDOWN. . . . . . . . . . . . . . . . . . . . . . . . . 104
7.6.5. ERROR . . . . . . . . . . . . . . . . . . . . . . . . . . 105
7.6.6. REPAIR. . . . . . . . . . . . . . . . . . . . . . . . . . 106
7.6.7. Negative Acknowledgements . . . . . . . . . . . . . . . . 106
8. Security Considerations . . . . . . . . . . . . . . . . . . . 106
9. Authors's Address . . . . . . . . . . . . . . . . . . . . . . 107
References . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
1. Introduction
In this document, we specify the protocols and procedures that
compose Inter-Domain Policy Routing (IDPR). The objective of IDPR is
to construct and maintain routes between source and destination
administrative domains, that provide user traffic with the services
requested within the constraints stipulated for the domains
transited. IDPR supports link state routing information distribution
and route generation in conjunction with source specified message
forwarding. Refer to [5] for a detailed justification of our
approach to inter-domain policy routing.
1.1. Domain Elements
The IDPR architecture has been designed to accommodate an
internetwork with tens of thousands of administrative domains
Steenstrup